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Commit c91f48d6 authored by Guido Barzini's avatar Guido Barzini Committed by David S. Miller
Browse files

sfc: Survive ISR0=0 bug in the shared IRQ case 



Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2e803407

drivers/net/sfc/nic.c

+9 −0
Original line number Original line Diff line number Diff line
@@ -1384,6 +1384,15 @@ static irqreturn_t efx_legacy_interrupt(int irq, void *dev_id) 
		efx->last_irq_cpu = raw_smp_processor_id();

		efx->last_irq_cpu = raw_smp_processor_id();

		EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_DWORD_FMT "\n",

		EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_DWORD_FMT "\n",

			  irq, raw_smp_processor_id(), EFX_DWORD_VAL(reg));

			  irq, raw_smp_processor_id(), EFX_DWORD_VAL(reg));

	} else if (EFX_WORKAROUND_15783(efx)) {

		/* We can't return IRQ_HANDLED more than once on seeing ISR0=0

		 * because this might be a shared interrupt, but we do need to

		 * check the channel every time and preemptively rearm it if

		 * it's idle. */

		efx_for_each_channel(channel, efx) {

			if (!channel->work_pending)

				efx_nic_eventq_read_ack(channel);

		}

	}

	}





	return result;

	return result;